D29080: [kcms/fonts] Guide users towards KScreen KCM for making things bigger on-screen

[Nathaniel Graham]

ngraham created this revision.
ngraham added reviewers: VDG, Plasma.
Herald added a project: Plasma.
Herald added a subscriber: plasma-devel.
ngraham requested review of this revision.

REVISION SUMMARY
  Many users seem to like using Force Fonts DPI or (less commonly) the font sizes to
  increase the scale of UI elememnts to suit their screen. This is not the recommended
  approach, and we are constantly telling users this in bug reports and social media, but
  there's nothing in the UI itself to make people aware of that in the first place.
  
  This patch is an attempt to rectify that by showing gentle informational messages guiding
  users towards the KScreen KCM if they adjust settings on the Fonts KCM in a way that
  suggests they are trying to make everything bigger.

TEST PLAN
  F8252619: font kcm warnings.webm <https://phabricator.kde.org/F8252619>

REPOSITORY
  R119 Plasma Desktop

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D29080

AFFECTED FILES
  kcms/fonts/fonts.cpp
  kcms/fonts/fonts.h
  kcms/fonts/package/contents/ui/main.qml

To: ngraham, #vdg, #plasma
Cc: plasma-devel, Orage, LeGast00n, The-Feren-OS-Dev, cblack, jraleigh, zachus, fbampaloukas, ragreen, ZrenBot, ngraham, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, ahiemstra, mart
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