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bug#34710: the mode line flicks on set-window-vscroll

From: Tak Kunihiro
Subject: bug#34710: the mode line flicks on set-window-vscroll
Date: Thu, 07 Mar 2019 09:25:18 +0900 (JST)

With my casual test, the patch makes pixel-wise scroll 5% faster.

> On Mar 6, 2019, at 17:06 , Alan Third <address@hidden> wrote:
> On Tue, Mar 05, 2019 at 06:09:41PM +0100, Robert Pluim wrote:
>> Robert Pluim <address@hidden> writes:
>>> so not 4k, and I normally run with multiple non-maximized frames (but
>>> my testing was with a single default frame).
>> So Iʼve decided that this was all down to key-repeat rate. I had that
>> set to maximum already, but I went into system preferences, set it
>> lower, exited emacs, set it back, and now emacs with your patch is OK.
> Good to know, but still sounds like performance could be improved.
> And I still can’t replicate it. Perhaps it’s a combination of multiple
> factors.
> Can you try this patch and see if it improves anything, please?
> modified   src/nsterm.m
> @@ -1168,7 +1168,6 @@ static NSRect constrain_frame_rect(NSRect frameRect, 
> bool isFullscreen)
> #ifdef NS_IMPL_COCOA
>   [NSGraphicsContext setCurrentContext:nil];
> -  [view display];
> #else
>   block_input ();
> It’s possible this will cause it to drop frames and make things worse.

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