Kobo: Refactor various aspects of the Kaleido/MTK support (#12221)

* UIManager: Let the fb backend deal with Kaleido wfm promotion. This fixes a number of quirks that poisoned the refresh queue with spurious full-screen refreshes. See https://github.com/koreader/koreader-base/pull/1865 for more details.
* This also means we now disable Kaleido waveform modes when color rendering is disabled (remember to trash your thumbnail cache if you don't want to mix color w/ grayscale thumbnails, though).
* UIManager: Merge refreshes that share an edge, because that was driving me nuts (and would have most likely been merged by the kernel anyway). A perfect test-case is the FM, which trips two separate refreshes because of its title bar.
* ReaderFlipping: Use sensible dimensions, so that we only refresh the icon's region.
* ReaderBookmark: Only refresh the dogear instead of the whole page when toggling bookmarks.
* NetworkSetting: Make it a real boy, so it consistently refreshes properly on dismiss instead of relying on UIManager saving the day.
* Kobo: Aggressively prevent *both* suspend & standby while MTK devices are plugged-in, as both will horribly implode the kernel (we previously only prevent standby while charging).
* Kobo: Switch to 8bpp on B&W MTK devices (or when color rendering is disabled on Kaleido panels).

plugins/coverbrowser.koplugin/listmenu.lua

@@ -239,16 +239,16 @@ function ListMenuItem:update()
             height_overflow_show_ellipsis = true,
         }
         widget = OverlapGroup:new{
-            dimen = dimen,
+            dimen = dimen:copy(),
             LeftContainer:new{
-                dimen = dimen,
+                dimen = dimen:copy(),
                 HorizontalGroup:new{
                     HorizontalSpan:new{ width = pad_width },
                     wleft,
                 }
             },
             RightContainer:new{
-                dimen = dimen,
+                dimen = dimen:copy(),
                 HorizontalGroup:new{
                     wright,
                     HorizontalSpan:new{ width = pad_width },
@@ -639,7 +639,7 @@ function ListMenuItem:update()
             end
 
             local wmain = LeftContainer:new{
-                dimen = dimen,
+                dimen = dimen:copy(),
                 VerticalGroup:new{
                     wtitle,
                     wauthors,
@@ -648,7 +648,7 @@ function ListMenuItem:update()
 
             -- Build the final widget
             widget = OverlapGroup:new{
-                dimen = dimen,
+                dimen = dimen:copy(),
             }
             if self.do_cover_image then
                 -- add left widget
@@ -673,13 +673,13 @@ function ListMenuItem:update()
             end
             -- add padded main widget
             table.insert(widget, LeftContainer:new{
-                    dimen = dimen,
+                    dimen = dimen:copy(),
                     wmain
                 })
             -- add right widget
             if wright then
                 table.insert(widget, RightContainer:new{
-                    dimen = dimen,
+                    dimen = dimen:copy(),
                     HorizontalGroup:new{
                         wright,
                         HorizontalSpan:new{ width = wright_right_padding },
@@ -758,7 +758,7 @@ function ListMenuItem:update()
                 fontsize_no_bookinfo = fontsize_no_bookinfo - fontsize_dec_step
             until text_widget:getSize().h <= dimen.h
             widget = LeftContainer:new{
-                dimen = dimen,
+                dimen = dimen:copy(),
                 HorizontalGroup:new{
                     HorizontalSpan:new{ width = Screen:scaleBySize(10) },
                     text_widget
@@ -766,10 +766,10 @@ function ListMenuItem:update()
             }
             if wright then -- last read date, in History, even for deleted files
                 widget = OverlapGroup:new{
-                    dimen = dimen,
+                    dimen = dimen:copy(),
                     widget,
                     RightContainer:new{
-                        dimen = dimen,
+                        dimen = dimen:copy(),
                         HorizontalGroup:new{
                             wright,
                             HorizontalSpan:new{ width = wright_right_padding },