D11237: Clip character drawing to its own cell

[Mariusz Glebocki]

mglb created this revision.
mglb added a reviewer: Konsole.
mglb added a project: Konsole.
mglb requested review of this revision.

REVISION SUMMARY
  To calculate string width, Konsole uses character cell widths.
  Rendering engine uses actual characters widths for this purpose.
  Those sizes are equal in fixed-width fonts, as long as the font
  has specific character. Since no font contains all Unicode characters,
  some of them are taken from different fonts and their sizes differ
  from their cell size. This can lead to different results depending
  on how text line is split into strings.
  
  It can be assumed that characters in Basic Latin block in every
  fixed-width font are really fixed-width, and can be rendered as one
  string. All other characters are rendered separately, and their
  rendering surface is limited to their cell.
  
  Before/After screenshots:
  F5749612: clipping.png <https://phabricator.kde.org/F5749612>
  
  BUG: 361547

TEST PLAN
  Paste this: `⸻test` in konsole and highlight different parts of the string
  
  In a text editor paste this:
  
    | A |
    | ⸻ |
    | ⟹ |
    | ⧠ |
  
  and move cursor vertically through characters column

REPOSITORY
  R319 Konsole

REVISION DETAIL
  https://phabricator.kde.org/D11237

AFFECTED FILES
  src/TerminalDisplay.cpp

To: mglb, #konsole
Cc: #konsole, herrold, ngraham, hindenburg
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