TouchMenu: Workaround an EPDC race in the hold handler w/ flash_ui (#…

…7325) * Also bump base, because it's mildly related koreader/koreader-base#1312
koreader · Feb 21, 2021 · e582036 · e582036
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commit e582036
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Showing 2 changed files with 7 additions and 1 deletion.
diff --git a/base b/base
diff --git a/frontend/ui/widget/touchmenu.lua b/frontend/ui/widget/touchmenu.lua
@@ -215,6 +215,12 @@ function TouchMenuItem:onHoldSelect(arg, ges)
         UIManager:setDirty(nil, "fast", highlight_dimen)
 
         UIManager:forceRePaint()
+        -- NOTE: These very specific circumstances appear to reliably upset the EPDC,
+        --       causing a mild variant of our racey friend the papercut refresh glitch ;).
+        --       As it appears to stem from the race between *this* refresh for the highlight and the following writes to the fb,
+        --       let the kernel take a breather. It'll yield back to us when it's done.
+        --       Expect it to block for ~150 to 350ms. Given the context (a hold gesture), we can absorb the latency hit mostly unnnoticed.
+        UIManager:waitForVSync()
 
         -- Unhighlight
         --