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  1. Qt
  2. QTBUG-29930

Unicode script itemization code needs to be re-worked

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Details

    • Bug
    • Resolution: Unresolved
    • P2: Important
    • None
    • 4.5.0, 5.0.1
    • GUI: Text handling
    • None
    • 0ec07b68ad34e135451dd5291732bf73d297ba0c

    Description

      Currently, there are three major issues:
      1. The Unicode Script itemization code is quite outdated (I believe it hasn't been changed since Unicode 4.0 times, or even longer) and doesn't provide us with good enough results for mixed scripts cases.
      2. When the text formatting is used, the script item might be broken by the format range boundaries anywhere, even in the middle of grapheme cluster, which causes the text to be shaped/rendered with artifacts and other glitches, up to making the text completely unreadable.
      3. The text capitalization transform is treated like the text formatting option and may cause issue 2 as well. This also prevents implementing the context-sensitive case-changing properly.

      Attachments

        Issue Links

          depends on

          Task - A task that needs to be done. QTBUG-5472 Update Unicode Database to 7.0

          • P1: Critical - Urgent and Important, will STOP the release if matched with set FixVersion field. This includes regressions from the last version that are not edge cases; Data loss; Build issues; All but the most unlikely crashes/lockups/hanging; Serious usability issues and embarrassing bugs & Bugs critical to a deliverable. This is the highest possible priority for requirements.
          • Closed

          Task - A task that needs to be done. QTBUG-33764 Unicode BiDi itemization code needs to be updated / re-worked

          • P3: Somewhat important - Should be fixed, but doesn't affect the release in any way.
          • Closed
          is required for

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-4139 Complex scripts: When a diacritic is color differently to the base character then the position of the diacrtic is incorrect

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Open

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-17337 Lower-casing using QFont::AllLowercase is done char by char, thus context sensitive lowercasing does not work.

          • P3: Somewhat important - Should be fixed, but doesn't affect the release in any way.
          • Open

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-16168 When changing the color of an Arabic character then it will cause the word to split up even though it should be combined

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-28813 Problem with printing some arabic chars.

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-29787 Falsely rendering Mongolian OpenType text

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-28142 Problem with printing some arabic chars.

          • P3: Somewhat important - Should be fixed, but doesn't affect the release in any way.
          • Closed

          Task - A task that needs to be done. QTBUG-18980 Use harfbuzz-ng for text layout

          • P3: Somewhat important - Should be fixed, but doesn't affect the release in any way.
          • Closed
          relates to

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-39377 Mixed Left-to-Right and Right-to-Left text in QTextBrowser rendering issues on Android

          • P1: Critical - Urgent and Important, will STOP the release if matched with set FixVersion field. This includes regressions from the last version that are not edge cases; Data loss; Build issues; All but the most unlikely crashes/lockups/hanging; Serious usability issues and embarrassing bugs & Bugs critical to a deliverable. This is the highest possible priority for requirements.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-39930 QGraphicsTextItem->setHtml() ignores runtime loaded font

          • P1: Critical - Urgent and Important, will STOP the release if matched with set FixVersion field. This includes regressions from the last version that are not edge cases; Data loss; Build issues; All but the most unlikely crashes/lockups/hanging; Serious usability issues and embarrassing bugs & Bugs critical to a deliverable. This is the highest possible priority for requirements.
          • Closed

          Task - A task that needs to be done. QTBUG-33763 Update Unicode database and algorithms up to 6.0

          • P3: Somewhat important - Should be fixed, but doesn't affect the release in any way.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-36066 Qt5 apps cannot display japanese characters properly when compiled with HarfBuzz-NG

          • Not Evaluated - Not yet evaluated/prioritized
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-35836 Arabic text is badly broken

          • P1: Critical - Urgent and Important, will STOP the release if matched with set FixVersion field. This includes regressions from the last version that are not edge cases; Data loss; Build issues; All but the most unlikely crashes/lockups/hanging; Serious usability issues and embarrassing bugs & Bugs critical to a deliverable. This is the highest possible priority for requirements.
          • Closed
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              ritt.ks Konstantin Ritt
              ritt.ks Konstantin Ritt
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              Dates

                Created:
                Updated:

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