[okular] [Bug 473495] New: Give an option not to apply compatibility decomposition when copying

[Huanyu Liu]

https://bugs.kde.org/show_bug.cgi?id=473495

            Bug ID: 473495
           Summary: Give an option not to apply compatibility
                    decomposition when copying
    Classification: Applications
           Product: okular
           Version: 22.12.3
          Platform: Ubuntu
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: okular-devel at kde.org
          Reporter: 1293660441 at qq.com
  Target Milestone: ---

SUMMARY
When copying from Okular, all characters will be completely decomposed, i.e.
both canonical decomposition and compatibility decomposition will be applied
(see the Unicode Standard). While canonical decompostion is fine at most time,
compatibility decomposition is not always desired, since some formatting
information will be lost. It is especially a problem for punctuations in
Chinese, because we almost always use fullwidth characters, but they are
defined as compatibility decomposable to their ASCII counterparts, which are
almost never used (unless when mixed with Latin scripts, and those ASCII
counterparts are used exclusively for them).


STEPS TO REPRODUCE
1. Create any text file with the content "你好，世界！"
2. Open it with Okular
3. Copy the content

OBSERVED RESULT
The copied result is "你好,世界!", where "，" (U+FF0C) is turned into "," (U+U+002C)
and "！" (U+FF01) is turned into "!" (U+0021).

EXPECTED RESULT
We should have an option to turn off compatibility decomposition (or canonical
decomposition, just in case) and the content should be copied as-is.

SOFTWARE/OS VERSIONS
Linux: Ubuntu 23.04
KDE Plasma Version: 5.27.4
KDE Frameworks Version: 5.104.0
Qt Version: 5.15.8

ADDITIONAL INFORMATION
The version provided by Ubuntu may be a little old, but that shouldn't matter.

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