D11763: Properly handle wheel in read-only mode

[Mariusz Glebocki]

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

REVISION SUMMARY
  - Do not allow sending mouse events and emulated up/down keys to programs when read-only mode is enabled.
  - Set the currentTerminalDisplay before sending key events, like in keyPressEvent.
  - The code is restructured a bit to easily separate code allowed only when read-only mode is disabled.

TEST PLAN
  - start Konsole
  - run `man man` and do not press any key
  - try to scroll using mouse wheel - the text should scroll
  - exit
  
  - start Konsole
  - run `man man`
  - turn on read only mode
  - try to scroll using mouse wheel - the text should not scroll
  - turn off read only mode
  - try to scroll - the text should scroll normally, without jump too far
  - exit
  
  - start Konsole
  - run `man man`
  - press Down key
  - turn on read only mode
  - try to scroll using mouse wheel - the text should not scroll
  - turn off read only mode
  - try to scroll - the text should scroll normally, without jump too far
  - exit

REPOSITORY
  R319 Konsole

BRANCH
  arc/properly-handle-wheel-in-read-only-mode

REVISION DETAIL
  https://phabricator.kde.org/D11763

AFFECTED FILES
  src/TerminalDisplay.cpp

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