Limit memory consumed by previewer in inactive tabs

[ForNeVeR]

We have several reports in Rider with this:

Root 1:
[6.21K/  0%/ 406MB]  813MB          1   ROOT: Static field: java.awt.KeyboardFocusManager.currentFocusCycleRoot
[6.21K/  0%/ 406MB]  813MB          1   (root): com.intellij.openapi.fileEditor.impl.EditorCompositePanel
[5.75K/  0%/ 406MB]  813MB          1   parent: com.intellij.openapi.fileEditor.impl.EditorTabs
[  127/  0%/ 405MB]  812MB          1   visibleInfos: java.util.ArrayList
[  127/  0%/ 405MB]  812MB          1   elementData: java.lang.Object[]
[  127/  0%/ 405MB]  812MB         29   []: com.intellij.ui.tabs.TabInfo
[   70/  0%/ 405MB]  812MB         24   component: com.intellij.openapi.fileEditor.impl.EditorCompositePanel
[   50/  0%/ 405MB]  812MB          9   focusComponent: com.intellij.openapi.fileEditor.impl.EditorComposite$$Lambda+0x0000029e2281d9b0
[   50/  0%/ 405MB]  812MB          9   arg$1: com.jetbrains.rider.xaml.splitEditor.XamlSplitEditorImpl
[   50/  0%/ 405MB]  812MB          9   previewEditor: me.fornever.avaloniarider.idea.editor.AvaloniaRemotePreviewEditor
[    7/  0%/ 405MB]  811MB          7   editorComponent: me.fornever.avaloniarider.idea.editor.BitmapPreviewEditorComponent
[    7/  0%/ 405MB]  811MB          7   frameBufferView: kotlin.SynchronizedLazyImpl!1
[    7/  0%/ 405MB]  811MB          7   _value: me.fornever.avaloniarider.idea.editor.PreviewImageView
[    7/  0%/ 405MB]  405MB          7   lastFrame: me.fornever.avaloniarider.controlmessages.FrameMessage
[    7/  0%/ 405MB]  405MB          7 * data: byte[]

So, there seems to be 800/400 MiB consumed by the bitmaps in memory!

We should do something about that.

Either some adaptive caching strategy, or backing these to file buffers when inactive, or something else.