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  1. Qt
  2. QTBUG-93858

Some XKB letter keysyms are not properly converted to corresponding Qt keys

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Details

    • Linux/Wayland, Linux/X11
    • 6ecde6265a08163d47a834cb5591fdb22461d129 (qt/qtbase/dev), fd747db75 (tqtc/lts-5.15)

    Description

      Symbol Expected Actual
      XKB_KEY_mu


      0x0b5      , Latin 1 charset,
      U+00B5 MICRO SIGN      		 Qt::Key_mu



      0x0b5      , Latin 1      		 0x07cc, no Qt::Key enum

      corresponds       to XKB_KEY_Greek_MU, Latin/Greek,
      U+039C GREEK CAPITAL LETTER MU
      XKB_KEY_ydiaeresis


      0x0ff      , Latin 1 charset,
      U+00FF LATIN SMALL LETTER Y WITH DIAERESIS      		 Qt::Key_ydiaeresis



      0x0ff      , Latin 1 charset      		 0x13be, no Qt::Key enum

      corresponds       to XKB_KEY_Ydiaeresis,
      Latin 9,
      U+0178 LATIN CAPITAL LETTER Y WITH DIAERESIS

      Usually, Qt::Key letters 1 are just upper case versions of corresponding Latin 1 letters, but that's not always the case: some Latin 1 letters 2 do not have their upper-case representation within Latin 1 charset itself 3, as seen in the table above. That letters represented in Qt::Key by their lower-case Latin1 variants instead.

      SOLUTION:
      We should not convert Latin 1 letter to upper-case, if it's upper-case representation doesn't fit to Latin 1 charset. It's lower-case variant should be used as Qt key instead.

      1. https://code.woboq.org/qt6/qtbase/src/corelib/global/qnamespace.h.html#Qt::Key
      2. https://en.wikipedia.org/wiki/Mu_(letter)#Character_encodings
      3. https://en.wikipedia.org/wiki/ISO/IEC_8859-1#Code_page_layout

      Attachments

        Issue Links

          relates to

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-89620 QKeySequence does not handle Qt::Key_mu right

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

          Technical task - A technical task. QTBUG-117158 Unify case canonicalization in key mapping

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

          Suggestion - Public suggestions QTBUG-72361 Add LowerCase letters to Qt::Key enumerator.

          • P4: Low - Would be nice to fix, but it's not very important.
          • Closed
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              liaqi Liang Qi
              bam80 Andrey Butirsky
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              Dates

                Created:
                Updated:
                Resolved: