REGRESSION(r237196): Web Inspector: Computed panel shouldn't update when it isn't visible

[Nikita Vasilyev]

Currently, Computed panel gets updated even when another panel, such as Styles, is selected. There's a lot of unnecessary work happening.

This doesn't appear to be a regression.

[Radar WebKit Bug Importer]

<rdar://problem/49664912>

[Nikita Vasilyev]

It seems like there's logic in-place. However, it has been broken for years and maybe never even worked.


GeneralStyleDetailsSidebarPanel.js:

    visibilityDidChange()
    {
        super.visibilityDidChange();

        if (!this._panel)
            return;

        if (!this.visible) { // <-- NEVER PASSES!
            this._panel.hidden(); 
            return;
        }

        this._updateNoForcedPseudoClassesScrollOffset();

        this._panel.shown();
        this._panel.markAsNeedsRefresh(this.domNode);
    }

So, what is this `visible` property and why is it always false there.

SidebarPanel.js:

    get visible()
    {
        return this.selected && this.parentSidebar && !this.parentSidebar.collapsed;
    }

Okay, the sidebar panel has to be selected to be visible.

Sidebar.js:

    set selectedSidebarPanel(sidebarPanelOrIdentifierOrIndex)
    {
        var sidebarPanel = this.findSidebarPanel(sidebarPanelOrIdentifierOrIndex);
        if (this._selectedSidebarPanel === sidebarPanel)
            return;

        if (this._selectedSidebarPanel) {
            if (this._selectedSidebarPanel.visible) {
                this._selectedSidebarPanel.hidden();
                this._selectedSidebarPanel.visibilityDidChange(); // <-- `visible` is true because `selected` hasn't been set to false yet!
            }

            this._selectedSidebarPanel.selected = false;
        }

[Nikita Vasilyev]

Actually, this regressed 6 months ago in https://trac.webkit.org/changeset/237196/webkit.

[Nikita Vasilyev]

Created attachment 366895 [details]
Patch

[WebKit Commit Bot]

Comment on attachment 366895 [details]
Patch

Clearing flags on attachment: 366895

Committed r243964: <https://trac.webkit.org/changeset/243964>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.