StackContainer: add in option for prerendering panes

[Nathan Toone]

an attribute of "prerender" would be helpful for rendering all child panes offscreen (using visibility:hidden instead of display:none).

The default would be false - which is the current behavior.

[Adam Peller]

rather than branch the code, can we just make this the default? Any advantages to the display:none approach?

[Nathan Toone]

Patch to add prerendering to stack container

[bill]

Yup, this issue is already documented in #5672, but thanks for the patch.

(As peller suggested idea is to just make visbility:hidden the default)

[bill]

Oh I misunderstood this ticket... the goal wasn't to fix mis-layouts that occur due to display:none... it's to eliminate delay when switching between tabs by pre-rendering all the tabs. And it applies to any kind of tab, not just a ContentPane with multiple layout widgets inside of it.

Of course, the downside of this is that the initial page load is longer.

[bill]

Due to the IE6 problems with visibility:hidden thing, I don't want to add this in as an actual option. It's something we can't support well so I don't want to go down that slope.

So, I'm going to close this ticket for now, listing that as a workaround.

Note that the StackContainer/TabContainer code has many places where it just resizes the selected pane... those would all need to be changed to resize every pane.