more tests

tests/testthat/_snaps/layout_quad.md

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+# add `align` object works well
+
+    Cannot add `align_dendro()` to `quad_free()`
+    i `quad_free()` cannot align observations in vertical direction
+
+---
+
+    Cannot add `ggalign()` to `quad_free()`
+    i `quad_free()` cannot align observations in vertical direction
+
+---
+
+    Cannot add `align_kmeans(3L)` to `quad_free()`
+    i `quad_free()` cannot align observations in horizontal direction
+
+# add `stack_layout()` builds well
+
+    Cannot add `stack_freev()` to `quad_free()`
+    i no active annotation stack
+    i try to activate an annotation stack with `anno_*()`
+
+---
+
+    Cannot add `stack_freev()` to `quad_free()`
+    i top annotation stack already exists
+
+---
+
+    Cannot add `(stack_freev() + quad_free(mpg) + quad_free(mpg))` to `quad_free()`
+    i annotation stack cannot contain nested layout
+
+---
+
+    Cannot add `stack_freeh()` to `quad_free()`
+    i only vertical stack is allowed in top annotation
+
+---
+
+    Cannot add `stack_alignv()` to a `quad_free()`
+    i `quad_free()` cannot align observations in vertical direction
+
+---
+
+    Cannot add `stack_alignh()` to `quad_alignh()`
+    i no active annotation stack
+    i try to activate an annotation stack with `anno_*()`
+
+---
+
+    Cannot add `stack_freev()` to `quad_alignh()`
+    i no active annotation stack
+    i try to activate an annotation stack with `anno_*()`
+
+---
+
+    Cannot add `stack_freev()` to `quad_alignh()`
+    i top annotation stack already exists
+
+---
+
+    object 'mpsmall_matg' not found
+
+---
+
+    Cannot add `(stack_freev() + quad_free(mpg) + quad_free(mpg))` to `quad_alignh()`
+    i annotation stack cannot contain nested layout
+
+---
+
+    Cannot add `(stack_alignh() + ggheatmap(small_mat) + ggheatmap(small_mat))` to `quad_alignh()`
+    i annotation stack cannot contain nested layout
+
+---
+
+    Cannot add `stack_freeh()` to `quad_alignh()`
+    i only vertical stack is allowed in top annotation
+
+---
+
+    Cannot add `stack_alignv()` to a `quad_alignh()`
+    i `quad_alignh()` cannot align observations in vertical direction
+
+---
+
+    Cannot add `stack_alignv()` to `quad_alignv()`
+    i no active annotation stack
+    i try to activate an annotation stack with `anno_*()`
+
+---
+
+    Cannot add `stack_freeh()` to `quad_alignv()`
+    i no active annotation stack
+    i try to activate an annotation stack with `anno_*()`
+
+---
+
+    Cannot add `stack_freeh()` to `quad_alignv()`
+    i top annotation stack already exists
+
+---
+
+    Cannot add `stack_alignv()` to `quad_alignv()`
+    i left annotation stack already exists
+
+---
+
+    Cannot add `(stack_freeh() + quad_free(mpg) + quad_free(mpg))` to `quad_alignv()`
+    i annotation stack cannot contain nested layout
+
+---
+
+    Cannot add `(stack_alignv() + ggheatmap(small_mat) + ggheatmap(small_mat))` to `quad_alignv()`
+    i annotation stack cannot contain nested layout
+
+---
+
+    Cannot add `stack_freeh()` to `quad_alignv()`
+    i only vertical stack is allowed in top annotation
+
+---
+
+    Cannot add `stack_alignh()` to `quad_alignv()`
+    i only vertical stack is allowed in top annotation
+