D23845: Add a mode to center actions and omit the title when using a ToolBar style

[Nathaniel Graham]

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

REVISION SUMMARY
  This patch implements an optional and off-by-default feature to center the actions and
  omit the title when displaying the ToolBar style. This is useful for simple desktop apps
  that don't need to display a title in the toolbar, where centered toolbuttons look
  better than right-aligned toolbuttons.
  
  FEATURE: 404203
  CCBUG: 402948
  FIXED-IN: 5.63

TEST PLAN
  Apply this patch to Kirigami then run Kamoso after applying DXXXXXX
  
  Before: F7338499: Before.png <https://phabricator.kde.org/F7338499>
  
  After: F7338498: After.png <https://phabricator.kde.org/F7338498>

REPOSITORY
  R169 Kirigami

BRANCH
  optional-centered-actions-with-no-title (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D23845

AFFECTED FILES
  src/controls/PageRow.qml
  src/controls/private/globaltoolbar/PageRowGlobalToolBarStyleGroup.qml
  src/controls/private/globaltoolbar/ToolBarPageHeader.qml

To: ngraham, #kirigami, #vdg, mart
Cc: plasma-devel, fbampaloukas, GB_2, domson, dkardarakos, apol, davidedmundson, mart, hein
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