[Libreoffice-bugs] [Bug 136345] UI: "Reset" in Transparency tab of Paragraph Style dialog resets to the last applied Area value, but shows the current value of the Area selection - which creates confusion

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=136345

sdc.blanco at youmail.dk changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|UI: Transparency preview    |UI: "Reset" in Transparency
                   |gone after pressing reset   |tab of Paragraph Style
                   |                            |dialog resets to the last
                   |                            |applied Area value, but
                   |                            |shows the current value of
                   |                            |the Area selection - which
                   |                            |creates confusion
             Status|UNCONFIRMED                 |NEW
                 CC|                            |sdc.blanco at youmail.dk
     Ever confirmed|0                           |1

--- Comment #1 from sdc.blanco at youmail.dk ---
@Telesto -- now you can confirm my extension of your report.

0. Open New Document; get to Transparency tab of a Paragraph Style dialog.
   Result:  Notice that preview is "blank"
1. Switch to Area tab, select any tab (except for none), notice Preview.
2. Switch back to Transparency.
   Result:  the selection shown in "Preview" in Area is shown as "Preview"
            in Transparency (for any of the non-None tabs in Area).
3. Press "Reset"
   Result:  the Preview is "blank"  (this happens for all non-"None" tabs
            in Area.  [this confirms the OP and extends it to all non-"None"
            tabs in Area]

Now go further to understand the source of the problem.

4. Switch to Area tab, select a tab (e.g., Pattern) and press "Apply"
5. Now repeat steps 2 and 3.
   Result:  the preview in Transparency will "reset" to what was "applied" 
            in the Area tab (e.g., the pattern if "Pattern" was used).

In sum:  "Reset" in "Transparency" resets to the "last applied" Area.  When
nothing has been saved for Area, it "resets" to "blank" (which is what
motivated the present bug report).  If something was applied in the Area tab,
then the
Transparency tab will "reset" to that value, regardless of which tab is
currently selected in Area.

However -- if you use "Apply" in Transparency -- with an "unapplied" Area
value, then *both* the "Area" and the "transparency" are applied. 

IOW, the transparency tab is inviting/allowing you to "test" transparency
values with an *unapplied* area value, where both can be saved simultaneously
with "Apply" in Transparency.  When you want to "reset" the Transparency tab to
get back to where you started -- then "transparency" does reset its values, but
it also "resets" the Area in the preview to the currently saved value for Area.

Probably what is needed is for the "preview" field for "transparency" to not
"reset" to the currently saved Area value, but to use whatever is currently
selected in Area, even if not saved.  That would respect the affordances of the
interface.

Tested with: 
Version: 7.2.0.0.alpha0+ (x64) / LibreOffice Community
Build ID: e60bebd4c5257b0f592d27c74399de1498ac725b
CPU threads: 8; OS: Windows 10.0 Build 19041; UI render: Skia/Raster; VCL: win

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