Kotlin DSL UI: scroll pane takes wrong height of MemberSelectionTable

Sorry this got lost. What does MemberSelectionTable extend from?

It's com.intellij.refactoring.ui.MemberSelectionTable and it extends AbstractMemberSelectionTable<PsiMember, MemberInfo>

Sorry for delay.

I failed to reproduce this behavior in 2020.2.4 with this simple test action/dialog on macOS. Could you please specify your IDE version and OS? Does this test code work on your system? Thanks.

import com.intellij.openapi.actionSystem.AnAction
import com.intellij.openapi.actionSystem.AnActionEvent
import com.intellij.openapi.ui.DialogWrapper
import com.intellij.psi.JavaPsiFacade
import com.intellij.psi.search.GlobalSearchScope
import com.intellij.refactoring.ui.MemberSelectionTable
import com.intellij.refactoring.util.classMembers.MemberInfoStorage
import com.intellij.ui.layout.panel
import javax.swing.JComponent

class TestDialogAction : AnAction() {

    override fun actionPerformed(e: AnActionEvent) {
        val project = e.project!!
        val wrapper = object : DialogWrapper(project) {
            init {
                title = "Test Dialog"
                super.init()
            }

            override fun createCenterPanel(): JComponent? {

                val clazz = JavaPsiFacade.getInstance(project)
                    .findClass("javax.swing.JTree", GlobalSearchScope.allScope(project))!!

                val storage = MemberInfoStorage(clazz) {
                    println(it.name)
                    true
                }
                val table = MemberSelectionTable(storage.getClassMemberInfos(clazz), null)
                return panel() {
                    row {
                        scrollPane(table)
                    }
                }
            }
        }
        wrapper.show()
    }
}

In your case members count is high enough to add scroll anyway. If you limit it, for instance, to 4:

var count = 0
val storage = MemberInfoStorage(clazz) {
    count++ < 4
}

you will see that only 3 members shown.

if I expand it by dragging with mouse, all 4 members shown and scroll disappears:

PS 2020.2.4 Ultimate, Windows 10 Pro

AbstractMemberSelectionTable constructor specifies "default' size/number of visible rows. You can override this in your code explicitly:

setPreferredScrollableViewportSize(JBUI.size(400, -1));
    setVisibleRowCount(12);

Thanks!

setVisibleRowCount doesn't work as expected, looks like header height still not used in calculation. I will use workaround with preferredScrollableViewportSize and calculate height with header manually.